questions Flashcards
hesitation to switch to digital
cost and image quality
showed two lines place on tooth
multi-line ruler
- What did Wilhelm Von Roetengen do?
discovered x-radiation
- Name 2 positives of tungsten as a target metal
high melting point
high atomic number
- Who was the first person to utilize radiographs for teeth?
otto walkoff
(Dr. kelly first in US)
- Who was the person who made the x-ray portable?
coolidge
- Question that gave multiple options and asked about thermionic emission.
electrons boil off filament
- Does the x-ray have high or low LET compared to alpha waves?
a. Alpha waves are an example of particulate radiation (contain mass) – things with mass have a high LET. X-rays are low LET bc no mass, travel at the speed of light, and have no charge!!
- In comparison to CMOS with radiation, CCD has
less radiation
atomic number measure?
protons
list two sources of ionizing radiation
xray and gamma
higher spatial resolution is found in
film- since better quality image
- Smaller focal spot ______ and bigger focal spot ______
better resolution
worse resolution
benefits of CMOS
digital manupulation
what does PSP use
laser lights
metal found in film
Ag-silver
- What type of radiation occurs when the electron strikes the nucleus?
bremsstrahlung
- What does the insulating oil do and where is it located?
insulating oil dissipates heat and it is located in tubehead (NOT XRAY TUBE)
- What happens when you change from alternating current to direct current?
decrease exposure and radiation dose
- Short answer question: What is qualitative imaging and what are examples of it?
mathematical alteration of the pixels. [uses mathematical manipulations of image data. examples are gray scale, contrast and brightness
short answer: what is analytical imaging and examples
measures lengths(ex:# of pixels for length, area and circumference) and pixel values(ex. bone, enamel, dentin)
- What is found in the cathode?
focusing cup and filament
where are x-rays produced
at the tungsten target
